The effect of the diurnal variation in temperature on densities derived from near-circular satellite orbits, with applications to SKYLAB 1 /1973-27A/

Details The effect of the diurnal variation in temperature on densities derived from near-circular satellite orbits, with applications to SKYLAB 1 /1973-27A/ The effect of the diurnal variation in temperature on densities derived from near-circular satellite orbits, with applications to SKYLAB 1 /1973-27A/

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27.1361m&link_type=abstract

Planetary and Space Science, vol. 27, Nov. 1979, p. 1361-1370. Research sponsored by the Science Research Council.

Physics

Atmospheric Density, Atmospheric Temperature, Diurnal Variations, Exosphere, Orbit Perturbation, Satellite Orbits, Temperature Effects, Annual Variations, Circular Orbits, Equatorial Atmosphere, Skylab 1

Scientific paper

Satellites in almost circular paths experience appreciable drag throughout the entire orbit; the localised effect being intrinsically related to the global distribution of exospheric temperature. To normalise the density values derived from such orbits to a fixed temperature, an effective exospheric temperature is required. In this paper a 'pseudo' exospheric temperature is determined analytically such that, by assuming the atmosphere is held constant at this temperature, the same perturbation in the semi-major axis is achieved as that by a satellite moving in an atmosphere exhibiting a realistic approximant to the measured diurnal variation in temperature. The theory is applied to data and densities derived from orbital analysis of Skylab 1 and the course of the semi-annual variation is retraced for 1974-1976.

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